diff options
Diffstat (limited to 'arch/x86_64/mm')
-rw-r--r-- | arch/x86_64/mm/Makefile | 2 | ||||
-rw-r--r-- | arch/x86_64/mm/mmap.c | 30 |
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/x86_64/mm/Makefile b/arch/x86_64/mm/Makefile index 1d232a87f113..d25ac86fe27a 100644 --- a/arch/x86_64/mm/Makefile +++ b/arch/x86_64/mm/Makefile | |||
@@ -2,7 +2,7 @@ | |||
2 | # Makefile for the linux x86_64-specific parts of the memory manager. | 2 | # Makefile for the linux x86_64-specific parts of the memory manager. |
3 | # | 3 | # |
4 | 4 | ||
5 | obj-y := init.o fault.o ioremap.o extable.o pageattr.o | 5 | obj-y := init.o fault.o ioremap.o extable.o pageattr.o mmap.o |
6 | obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o | 6 | obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o |
7 | obj-$(CONFIG_NUMA) += numa.o | 7 | obj-$(CONFIG_NUMA) += numa.o |
8 | obj-$(CONFIG_K8_NUMA) += k8topology.o | 8 | obj-$(CONFIG_K8_NUMA) += k8topology.o |
diff --git a/arch/x86_64/mm/mmap.c b/arch/x86_64/mm/mmap.c new file mode 100644 index 000000000000..43e9b99bdf25 --- /dev/null +++ b/arch/x86_64/mm/mmap.c | |||
@@ -0,0 +1,30 @@ | |||
1 | /* Copyright 2005 Andi Kleen, SuSE Labs. | ||
2 | * Licensed under GPL, v.2 | ||
3 | */ | ||
4 | #include <linux/config.h> | ||
5 | #include <linux/mm.h> | ||
6 | #include <linux/sched.h> | ||
7 | #include <linux/random.h> | ||
8 | #include <asm/ia32.h> | ||
9 | |||
10 | /* Notebook: move the mmap code from sys_x86_64.c over here. */ | ||
11 | |||
12 | void arch_pick_mmap_layout(struct mm_struct *mm) | ||
13 | { | ||
14 | #ifdef CONFIG_IA32_EMULATION | ||
15 | if (current_thread_info()->flags & _TIF_IA32) | ||
16 | return ia32_pick_mmap_layout(mm); | ||
17 | #endif | ||
18 | mm->mmap_base = TASK_UNMAPPED_BASE; | ||
19 | if (current->flags & PF_RANDOMIZE) { | ||
20 | /* Add 28bit randomness which is about 40bits of address space | ||
21 | because mmap base has to be page aligned. | ||
22 | or ~1/128 of the total user VM | ||
23 | (total user address space is 47bits) */ | ||
24 | unsigned rnd = get_random_int() & 0xfffffff; | ||
25 | mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT; | ||
26 | } | ||
27 | mm->get_unmapped_area = arch_get_unmapped_area; | ||
28 | mm->unmap_area = arch_unmap_area; | ||
29 | } | ||
30 | |||